Boat-davit.



COLUMBIA PLANOGRAPH co.,wAsmNuTON. 0. cv

Patnted. 0ct.21,1913.

2 SHEETS-SHEET 1.

J. ROEVER;

BOAT DAVIT.

APPLIOA TION FILED MAY 21, 1912. 1,076,454.

Patented Oct. 21, 1913.

2 SHEETS-SHEET 2.

i 34 3a 10 15-5 l ml 'LU'J x l' J bin 1mm: 5 mm,

COLUMBIA PLANOGRAPH 60., WASHINGTON, n. c

JULIUS nosvnn, or NEW YORK, n. Y.

IBOAT-IDAVIT.

Specification of Letters Patent.

Patented Oct. 21,1913.

Application filed May 21. 1912. Serial No. 698,744.

To all whom it may concern.

Be it known that I, JULIUS Ronvnn, of the city of New York, county of Queens, and State of New York, have invented a new and useful Improvement in Boat-Davits, of which the following is a full, clear, and exact description.

My invention relates to improvements in boat davits, and the object of my invention is to produce a simple apparatus which will serve as a davit to support a boat conveniently on the deck of a ship or steamer, or other vessel, and which can be operated by a worm gear so as to raise the boat either before or after it is loaded, and automatically cause the boat to slide by gravity to a position outside the line of the vessels hull, so that it can swing free and then be lowered safely into the water.

My invention comprises a davit which can be worked from either end of the apparatus or from both ends, and which holds the boat in such a way that it cannot be accidentally dropped, and when lowered will be at all times under the absolute control of the operators.

By using the worm gears to raise and lower the boat, I obviate the need of using ratchets and other devices which are likely to get out of order, and moreover the worm gears as arranged will hold the boat suspended at any desired point so that it Wlll only be lowered when its controlling shaft is turned by an operator.

In general my device is intended to produce a simple davit and convenient means for quickly launching a boat from the deck of a vessel.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar reference characters indicate corresponding parts in all the views.

Figure 1 is a broken sectional plan of the apparatus showing in detail the gearing for raising and lowering a boat. Fig. 2 is an end View thereof, showing the apparatus as applied to the deck of a vessel. Fig. 3 is a detail showing a front elevation of a portion of the apparatus. Fig. 4 is a side elevation on an enlarged scale of the temporary connection between the boat and its supporting blocks, and Fig. 5 is a broken front elevation of the structure shown in Fig. 4.

In the drawings 10 represents the deck of any vessel likely to carry boats, and 10 represents a life boat which can be of any usual kind. This is carried within a framework 11 which has posts 12 rising near opposite ends of the boat, and near the upper ends of the posts are pivoted as shown at 13 segments 14 which have teeth on one end as hereinafter described, and each of which is provided with an arm 15 having a longitudinal slot 16. It will be noticed that the inner end of the arm is inclined so that when the arm is raised to a generally horizontal position, the way formed by the slot 16 will have an outward inclination so that the boat when raised as hereinafter described, will automatically run to a position below the outer ends of the arms 15. The segments 14 are turned by a gear mechanism presently described, and they have lugs 17 which engage the posts 12 and pre vent the segments from turning too far. The boat is carried by pulleys 18 which run in the slots 16, and each pulley carries a stirrup 19, to the lower end of which is pivoted the upper sheave pulley of a pair of pulley blocks of the usual kind. The lower pulley block is hooked to the boat as shown at 21, and it will be understood that there will be similar connections at the stern and at the bow of the boat. It will be further understood that the mechanism which I describe at one end of the boat is just the same for the other end, so a description of both parts is not necessary. On the boat is a swinging hook 22 which is hinged to the boat as shown at 28, and there is one of these hooks at each end. Near the upper end the hook has a slot 24 adapted to receive the pin 24 of the stirrup 19, so that when in this position the boat will be suspended from the stirrups by the hooks 22. The outer end of the pin 24 has a cam 24 thereon, which is narrow enough to enter the slot 24, and which is adapted to engage the rollers 24 and 24 which are pivoted in the slot 24, and are out of vertical alinement with each other. When the boat is raised by the tackle and cables hereinafter referred to, the rollers will successively engage the cam 24 and automatically cast off the hooks 22 so as to leave the boat suspended by the cables running over the blocks or pulleys 20.

The following mechanism is used for tilting the arms 15 and raising the boat to the position shown by dotted lines in Fig. 2. Each segment 14 has on its inner side teeth which engage the pinion 26 on the vertical shaft 27 which turns in suitable brackets 28 and 29 on the posts 12, and at its lower end the shaft 27 connects by bevel gears 30 and 31 with the shaft 32 which extends parallel with the boat 10 and the shaft connects by means of the worm wheel 33 and worm 34 with a shaft 35 (see Fig. 2) which is mounted in suitable supports and which connects by means of a worm wheel 36 and worm 37 with a crank shaft 38 which is parallel with the shaft 32, and has cranks 39 at the ends. It will be seen that when the crank shaft is turned either from one or both ends, the movement will be imparted through the worm gearing described, to the segments 14 which will be tilted to the position shown by dotted lines in Fig. 2, and the boat 1O will be raised and will run by gravity to the outer ends of the arms 15, ready to be lowered. The worm gearing described will stay in any position, and when the boat is in a desired position for lowering, any further movement is prevented by the lugs 17 striking the posts 12.

To lower or raise the boat from the ends of the arms 15, the following mechanism is used: Loosely mounted on the shaft 32 and turning between collars 41 are drums which are grooved to carry the cables 40 for lowering the boat. These cables are at one end fast to the drum, and they run over the sheave pulley 20 in the usual manner. Each drum 40 has a worm wheel 42 thereon connecting with a worm wheel 43 on a transverse shaft 44 beneath the shaft 32, this shaft 44 being mounted in suitable bearings and havin the worm wheel 45 thereon connected wit a worm 46 on the shaft 47 This shaft is provided with cranks 48 or similar handles. When the boat is to be lowered, it is done by turning the shaft 48, and the worm gearing connecting the shaft with the drums will hold the boat in any desired position without the use of pawls or other detents. WVhen a boat is to be launched, the passengers can step into it from the deck before it is raised, and then it will be raised and carried to the outer ends of the arms 15 as already described. Up to this point it will be supported by the hooks 22 so that there will be no tension on the cable 4O until the boat travels to the position just described. As the cable 40 tightens, the operator or operators let go the crank 39 and take hold of the crank 48. The boat is then slightly raised by means of the gear mechanism connecting the shaft 47 with the drums 40. This causes the rollers 24 and 24 to strike the cam or abutment 24", so that the Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

,shown' by the lower dotted lines in Fig. 2,

before it is loaded, and the passengers can K step. in from the deck.

It will be seen that the arrangement which 1 have disclosed makes it possible to raise the boat from the deck, and have it automatically and safely carried beyond the vessels side, after which it can be perfectly controlled whether loaded or not.

From the foregoing description it will be seen that by reason of the gear connections which I have shown the operators, even when working theapparatus by hand, can handle a much larger boat than with the ordinary davits, and if power is applied to theoperating shafts, it will be readily seen that very much larger boats and power boats can be handled with the greatest ease. It will also be understood that life rafts or other life saving apparatus can be easily raised or lowered by means of the apparatus shown.

1. A boat davit of the kind described comprising a framework, gear operated segments pivoted in the framework, arms pivoted to the framework and tilted by the segments, ways or slots in the arms diverging from the pivoted connection, pulleys carried in the ways and adapted to support a boat, so that the boat drops by gravity when the arms are tilted, and gear means for raising the boat;

2. A boat davit comprising a framework, geared segments pivoted in the framework, means on the segments to engage the framework and limit the movement of the segments, pivoted tilting arms carried by the segments, slots in the arms, wheels carried in the slots, tackles carried by the wheels and supporting the boat, gear mechanism for operating the segments and tilting the arms, drums having a cable connection with the tackles, worm gears for operating the drums, hooks to engage the tackle support, said hooks having rollers in alinement with an abutment on the tackle for releasing the v hook by the raising of the boat, and means for raising and lowering the boat.

3. In a davit, the combination of the tilting arms and means for tilting them, of s tackles constructed to run on the arms and connect with the boat, hoisting mechanism having a cable connection with the tackles, and hinged hooks connected to the boat, said hooks having rollers in alinement with an abutment on the tackle, whereby the raising of the boat releases the hook.

I JULIUS ROEVER. Witnesses lVARREN B. HU'roHiNsoN, ARTHUR G. DANNELL,

Washington, D. G. 

